A total of six competitors were tested, QAC rep Joyce Tremblay wrote in an email to MMAjunkie.com (www.mmajunkie.com). The substances tested for are confidential, she added, and the individuals tested were not named. The commission did not answer a follow-up email requesting an explanation for why the names weren’t released.

In UFC 158’s headliner, welterweight champ Georges St-Pierre dominated Diaz over five rounds to retain his title. Afterward, Diaz contemplated retirement, then asked for a rematch.

Reps close to him now say he is retired unless he gets a rematch with St-Pierre or a superfight with Anderson Silva.

Beforehand, Diaz, who previously has been suspended twice for marijuana, put the UFC on notice that a third fail was possible.

“I’m sorry if I don’t pass the test, but I think it should work out,” he said. “I’ve passed plenty of them before, unless they just weren’t testing me. I wonder how much they test people around here.”

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